We started with a very very small team and did all the heavy lifting. Then they started adding PM, marketing, market people, HR, …
We were striving when we were not drowning in meetings, KPIs, management, emails, …
Small teams are more efficient but (obviously) can't produce at scale. When you scale up, there's enough HR or finance or marketing, or PM, etc. work for full-time specialists. And larger orgs need bureaucracy - if you have a way around that, the world is yours.
Why Mozilla won't let people financially contribute directly to Firefox development and continues to pursue these stupid monetization paths is a mystery.